> ## Documentation Index
> Fetch the complete documentation index at: https://docs.abbyy.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Documents tab in Document skills
> Upload, organize, and manage document sets to train and test Document skills in Advanced Designer.
The **Documents** tab shows every document used to set up, train, and test a [Document skill](/vantage/documentation/advanced-designer/document-skills/document-skills) and its activities.
When the **Documents** tab loads, a notification appears: **"*N* documents being copied…"** When copying finishes, the message updates to **"*N* documents copied"** and shows how long the operation took. The same message also appears in the notifications panel. *N* counts every document being copied — including demo documents added on the [**Publish** tab](/vantage/documentation/advanced-designer/document-skills/publish) — so it can be larger than the total across all document sets.
## Document sets
Documents are organized into sets. Each skill has an **All Documents** set, created by default, that contains every uploaded document. You can also create custom sets to use in individual activities or to test a skill. A custom set is always a subset of **All Documents**, and a single document can belong to multiple custom sets.
When a new activity is created, it uses **All Documents** by default. Custom sets are useful when a skill needs different extraction rules for different document variants — see [Classify By Text and Image activity](/vantage/documentation/advanced-designer/activities/classify-by-text-and-image).
The tab name reflects the active set. With **All Documents** selected, it reads **All Documents**. With a custom set selected, it reads `Documents: `.
### Create a custom document set
On the skill, switch to the **Documents** tab.
Click the add button in the list of document sets.
Provide a name for the custom set.
Add the documents you want the set to contain. The new set appears alongside **All Documents** and can be edited at any time.
## Test sets
You can create a document set used only for testing — for example, a balanced set of documents from one client. A test set isn't linked to any activity.
### Create a test set
On the **Documents** tab, click the add button in the list of document sets. If the documents you want are already uploaded, select them and choose **Create Set from Selection** on the shortcut menu.
Provide a name that identifies the set's purpose.
Select the set, then choose **Test Skill Using This Set** on the shortcut menu.
To test against an ad-hoc selection instead, choose **Test Skill** on the shortcut menu of one or more selected documents. Test sets are also selectable when labeling documents and when reviewing test results.
When you edit a skill that was created in Vantage, its document set also appears on the **Documents** tab.
## Upload and process documents
You can upload documents at any point by returning to the **Documents** tab. If the skill has a processing flow on the [Activities](/vantage/documentation/advanced-designer/document-skills/activities) tab, new uploads are processed automatically. Once processing completes, predicted labeling appears on the [Fields](/vantage/documentation/advanced-designer/document-skills/fields) tab, and reference labeling is generated from the predicted values. Uploads inside an activity editor also trigger processing.
Auto-generated reference labeling is **unconfirmed** until you copy predicted labeling to reference using the corresponding option on the documents' shortcut menu. Documents with unconfirmed labeling can't be used for training and are excluded from test results. To confirm labeling, review it on the **Fields** tab.
## View options
* **List View** — shows documents as a list with the upload date, the sets each document belongs to, and labeling status (in the **Reference Fields** column). For more on labeling, see [Fields](/vantage/documentation/advanced-designer/document-skills/fields).
* **Thumbnail View** — shows documents as thumbnails.
To preview a thumbnail at full size, use the preview button. Rotate the page from the preview window using the more options menu.
## Toolbar commands
Use the toolbar to edit the active document set.
| Command | What it does |
| :--------------------------------------------------------------------- | :-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Upload** | Upload documents to the selected set. Each upload is also added to **All Documents**. You can also drag documents in from File Explorer. |
| **Import Labeled Documents From Folder** (in the **Upload** drop-down) | Upload labeled documents to **All Documents**. Source folders can be exported from a training set, from manually reviewed processing results, or from ABBYY FlexiCapture — see [Importing labeled documents from a folder](/vantage/documentation/advanced-designer/labeling/labeling). |
| **Divide Set** | Split one set into two by ratio, producing separate training and testing collections. Each activity can then point at a specific set. |
| **Add from Set** | Add to the current set every document from another set that isn't already in the current set. |
| **Add to Set** | Add the selected documents to a different set. Disabled when the skill has only one set. |
| **Delete** | Delete the selected documents from the current set, or from every set. From **All Documents**, deletion always applies to every set. |
| **Rotate** | Change the orientation of the selected pages: **Rotate All Pages Left**, **Rotate All Pages Right**, or **Rotate All Pages 180°**. |
Sets that have fewer than 10 documents cannot be divided.
## Limits
Don't upload more than 10,000 documents to a single skill — beyond that, the skill may become unstable.
## Related topics
Define and label the fields you want to extract.
Build the document processing flow.
Test the skill and review extraction quality.
Manual and import-based labeling for training a skill.